Ammunition



A. CAMPBELL March 7, 1933.

AMMUNITION Filed May 23, 1931 W m m m m (ZMa/n (760/10 BY :2 Q. .1

A TTORNEYS.

of the base 10 engages the Wall Patented Mar. 7, 1933 UNITED STATESPATENT OFFICE TO REMINGTON ARMS COMPANY, IN 0., A CORPORATION OFDELAWARE AMMUNITION Application filed May 23,

This invention relates to anvils for ammunition primers, and embodiesthe discovery of a rinciple of anvil construction by the use of whichthe eificiency, sensitiveness and reliability are greatly increased.

In the drawing: Fig. 1 is a fragmentary sectional elevation of acartridge provided with an anvil according to the present invention.

lFig. 2 is an enlarged plan view of the anv1 Fig. 3 is an enlarged sideview of the anvil. Fig. 4-. is an enlarged sectional elevation of theanvil.

The function of an anvil is to provide a rigid body to receive the blowof the firing pin and to cause this blow to ignite the priming mixtureby the sudden application of pressure and friction to the part of thepriming mixture between the anvil and the firing pin. Anvils are ofvarious shapes but generally comprise a section of small area whichprojects toward or is embedded in the primmg mixture in position toreceive the blow of the firing pin.

The present invention comprises the discovery of a feature of anvilconstruction which greatly increases its efiiciency, particularly in thematter of insuring priming mixture ignition under the impact of acomparatively light blow. Said anvil is of generally hollow conicalform. It comprises a base portion 10 of substantially cylindricalexterior configuration, the periphery of the cylinder being interruptedby oppositely disposed openings or flash passages 11. Above the base 10isa section 12 of conical exterior and interior shape, and the apex ofthe cone is provided with a projection 13 adapted to extend toward or beembedded in the priming mixture 14 in the base of a primer cup 15, asshown in Fig. 1. The periphery of cup 15 to assist in holding the anvilin place. Associated with the projection 13 are one or more outwardlyextending ridges or ribs 16. Through the greater part of their lengththe ridges are of substantially V-cross-section, their upper ends mergewith the end of proportions merge jection 13 and their lower 1931.Serial No. 539,515.

with the conical surface 12. 'When the anvils are used in the mannerillustrated in Fig. 1 a substantial part of the ridges is embedded inthe priming mixture. It has been found that the provision of such ridgesgreatly increases the eflectiveness of the anvil, insuring the promptignition, under a comparatively light blow, of even diflicultlyignitable mixtures. These results may be due to the increasedconfinement of and friction upon the part of the priming mixture whichis disturbed by the blow of the firing pin, but any theoreticalexplanation is incapable of proof, inasmuch as a successful testdestroys the mixture.

Without departing from the spirit of the invention numerous variationsmay be made in the style and proportions of the anvil, the primer cupand other components of the cartridge or shell.

What is claimed is:

1. An anvil comprising an exteriorly cylindrical base, a conical bodyabove said base, a projection at the apex of said conical bod and spacedridges extending laterally from said projection.

An anvil comprising a hollow substantially conical body, a projectingpoint at the apex of said body, and a plurality of ridges projectingoutwardly from the periphery of said point and merging with said pointand said conical body.

3. A cartridge comprising a primer cup, an anvil in said cup comprisinga substan tially cylindrical base having its periphery in contact withthe wall of said cup, a point on said anvil projecting toward the baseof said cup, and substantially V-shaped ridges projecting laterally fromsaid point.

ALLAN CAMPBELL.

